Fuse box diagram, Ford, F250, 2011.
check wiring between trailer and tail lights.. you might have a broken wire..picture is just fyi (if your connector is round)
If the trucks lights are working then it is not a fuse. Is the rig equipped with a factory trailer package? If so check the connectors on the relay box and at the rear trailer connector where it connects to the trucks rear main harness.
What / where is relay box
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